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          Java日拱一卒-day7
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        <h2 id="定义类"><a href="#定义类" class="headerlink" title="定义类"></a>定义类</h2><p>类作为抽象的数据类型，用来描述相同类型的对象。面向对象编程就是定义这些类</p>
<h3 id="面向对象的分析"><a href="#面向对象的分析" class="headerlink" title="面向对象的分析"></a>面向对象的分析</h3><p>面向对象的思维方式就是已对象为中心来思考问题，分析对象的行为状态，抽出类的设计。识别类的简单规则是在分析问题的过程中寻找名词（对象），而方法则对应着动词（对象的行为）。</p>
<p>例如：</p>
<blockquote>
<p>有一个酒店，酒店有若干客房，向客户提供查询、入住、退房的功能</p>
</blockquote>
<p>上述描述中有“酒店”“客房”“客户”这样一些名词，这些名词所对应发对象很可能抽象为类（是否抽象成类，要视系统功能需求而定）。下文定义了一个酒店类Hotel</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">Hotel</span> </span>&#123;</span><br><span class="line"><span class="comment">//下面为描述类所属对象的性质和状态的数据成员</span></span><br><span class="line">    <span class="keyword">private</span> String hotelName;<span class="comment">//酒店名</span></span><br><span class="line">    <span class="keyword">private</span> String[][] rooms;<span class="comment">//酒店客房，存储客房的状态</span></span><br><span class="line"></span><br><span class="line">    <span class="comment">//两个构造方法</span></span><br><span class="line">    <span class="function"><span class="keyword">public</span> <span class="title">Hotel</span><span class="params">()</span> </span>&#123;</span><br><span class="line">        <span class="keyword">super</span>();</span><br><span class="line">    &#125;</span><br><span class="line">    <span class="function"><span class="keyword">public</span> <span class="title">Hotel</span><span class="params">(String hotelName,String [][] rooms)</span> </span>&#123;</span><br><span class="line">        <span class="keyword">this</span>.hotelName = hotelName;</span><br><span class="line">        <span class="keyword">this</span>.rooms = rooms;</span><br><span class="line">    &#125;</span><br><span class="line">    <span class="comment">//set,get方法,可以自动生成  ，是向外界的数据访问接口</span></span><br><span class="line">    <span class="function"><span class="keyword">public</span> String <span class="title">getHotelName</span><span class="params">()</span> </span>&#123;</span><br><span class="line">        <span class="keyword">return</span> hotelName;</span><br><span class="line">    &#125;</span><br><span class="line">    <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">setHotelName</span><span class="params">(String hotelName)</span> </span>&#123;</span><br><span class="line">        <span class="keyword">this</span>.hotelName = hotelName;</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    <span class="comment">//类方法</span></span><br><span class="line">    <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">Search</span><span class="params">()</span> </span>&#123;<span class="comment">//查询所有客房状态</span></span><br><span class="line"></span><br><span class="line">    &#125;</span><br><span class="line">    <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">Search</span><span class="params">(String roomNo)</span> </span>&#123;<span class="comment">//查询指定客房状态</span></span><br><span class="line"></span><br><span class="line">    &#125;</span><br><span class="line">    <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">checkin</span><span class="params">(String customer,String roomNo)</span> </span>&#123;<span class="comment">//入住</span></span><br><span class="line"></span><br><span class="line">    &#125;</span><br><span class="line">    <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">checkout</span><span class="params">(String roomNo)</span> </span>&#123;<span class="comment">//退房</span></span><br><span class="line"></span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>

<ul>
<li><ol>
<li>类的访问控制符&emsp;&emsp;<code>Hotel</code>类用<code>public</code>关键字修饰，表示<code>Hotel</code>类可以被其他类使用，且文件名必须与类名相同。类的访问控制符可以省略，代表其其访问范围为默认的<code>package</code></li>
</ol>
</li>
<li><ol start="2">
<li>数据成员<br>数据成员也叫成员变量，是类中记录对象性质和状态的变量，在类中以如下形式声明</li>
</ol>
</li>
</ul>
<blockquote>
<p>[修饰符] 数据类型 成员名[=默认值]</p>
</blockquote>
<p>修饰符可以是<code>public</code>、<code>protected</code>、<code>private</code>，或者不写时默认为<code>package</code>（四选一），它们可以与<code>static</code>、<code>final</code>组合<br>数据成员的数据类型可以是<code>Java</code>允许的任何数据类型，包括基本类型和引用类型。</p>
<ul>
<li><ol start="3">
<li>数据成员的<code>set</code>和<code>get</code>方法</li>
</ol>
</li>
</ul>
<p>定义类的时候应当遵循“信息的最小化公开”原则。应当尽可能使用方法来操作对象，不直接对数据成员进行存取。通常采用的方法是将数据成员声明为<code>private</code>类型，值允许在类的内部直接存取，外界则使用类声明的两个公开的接口（<code>set</code>和<code>get</code>方法）进行访问。例如Hotel中数据成员<code>hotelName</code>的<code>set</code>、<code>get</code>方法定义如下：</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br></pre></td><td class="code"><pre><span class="line"><span class="function"><span class="keyword">public</span> String <span class="title">getHotelName</span><span class="params">()</span> </span>&#123;</span><br><span class="line">        <span class="keyword">return</span> hotelName;</span><br><span class="line">    &#125;</span><br><span class="line">    <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">setHotelName</span><span class="params">(String hotelName)</span> </span>&#123;</span><br><span class="line">        <span class="keyword">this</span>.hotelName = hotelName;</span><br><span class="line">    &#125;</span><br></pre></td></tr></table></figure>

<ul>
<li><ol start="4">
<li>构造方法</li>
</ol>
</li>
</ul>
<p>构造方法是一种特殊的方法，用于为新创建的对象分配存储空间和对数据成员进行初始化，它只能在创建对象的时候用<code>new</code>命令调用。在定义构造方法的时候，构造方法名与类名相同，通常用<code>public</code>修饰，没有对返回值的定义。</p>
<p>构造方法通常被重载以提供无参、有参等多种初始化形式。程序运行时，编译系统会根据创建对象的参数情况匹配相应对应的构造方法。如果未定义构造方法，系统会提供一个默认的无参构造方法。</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line"><span class="function"><span class="keyword">public</span> <span class="title">Hotel</span><span class="params">()</span> </span>&#123;</span><br><span class="line"></span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>

<p>这对应着无参创建对象的方式：</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">Hotel hotel = <span class="keyword">new</span> Hotel();</span><br></pre></td></tr></table></figure>

<p>但是一旦创建了其他构造方法，编译系统将不再提供默认的无参构造器（而这种形式的构造往往经常用到），所以经常需要在类中自定义一个无参的构造方法。<br>有参构造方法定义 的时候，参数取名一般与初始化的数据成员同名，所以与<code>set</code>方法相同，在数据成员前加<code>this</code>加以区分。</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line"><span class="function"><span class="keyword">public</span> <span class="title">Hotel</span><span class="params">(String hotelName,String [][] rooms)</span> </span>&#123;</span><br><span class="line">        <span class="keyword">this</span>.hotelName = hotelName;</span><br><span class="line">        <span class="keyword">this</span>.rooms = rooms;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>

<p>该构造方法对应着创建对象的方法如下：</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">new</span> Hotel(<span class="string">"龙门客栈"</span>, <span class="keyword">new</span> String[<span class="number">10</span>][<span class="number">20</span>]);</span><br></pre></td></tr></table></figure>

<p>如果类中包含了多个重载的构造方法，而这些重载方法之间存在完全包含的关系，那么从软件设计的角度，不要把重复的代码书写多次，可以用一个构造方法去调用另一个构造方法。而构造方法只能在使用<code>new</code>关键字被调用，所以在构造方法中将使用<code>this</code>关键字。<code>this</code>调用只能在构造方法中使用，且必须是构造方法执行体的第一条语句。使用<code>this</code>调用重载的构造方法时，编译系统会根据<code>this</code>括号中的参数匹配与之对应的构造方法。<br>例如：</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">Hotel</span> </span>&#123;</span><br><span class="line">    <span class="keyword">private</span> String hotelName;</span><br><span class="line">    <span class="keyword">private</span> String[][] rooms;</span><br><span class="line">    <span class="function"><span class="keyword">public</span> <span class="title">Hotel</span><span class="params">()</span> </span>&#123;</span><br><span class="line">        <span class="keyword">super</span>();</span><br><span class="line">&#125;</span><br><span class="line">    <span class="function"><span class="keyword">public</span> <span class="title">Hotel</span><span class="params">(String hotelName)</span> </span>&#123;</span><br><span class="line">        <span class="keyword">this</span>.hotelName = hotelName;</span><br><span class="line">    &#125;</span><br><span class="line">    <span class="function"><span class="keyword">public</span> <span class="title">Hotel</span><span class="params">(String hotelName,String[][] rooms)</span> </span>&#123;</span><br><span class="line">        <span class="keyword">this</span>(hotelName);  <span class="comment">//this()调用已存在的构造方法</span></span><br><span class="line">        <span class="keyword">this</span> rooms = rooms;</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>

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